Specular reflection means the reflection on some in the form of a beam of light but not scattered. In this reflection unless the eye is placed in the path of the reflected beam the viewer is unaware of the existence of light. Diffuse reflection means the reflection of light energy in the scattered form in all direction. In this reflection the viewer can see the illuminated surface but not the light source.
Glare means the brightness within the field of vision of such a character as to cause annoyance, discomfort, interference with vision or eye fatigue.
A polar curve is a convenient way of showing how the candle power of a lamp varies in different directions. Polar curves are used to determine the M.H.C.P.,M.S.C.P. and the actual illumination of a surface by employing the candle power in the particular direction.
Due to its unsymmetrical shape.
Hard and long shadows are avoided by(a) using large numbers of small luminaires mounted over a minimum height of 2.5 metres, (2) using wide surface sources of light by using diffusing globe over filament lamp or by using indirect lighting system.
The flux emitted per unit area of the source in a direction at right angles to the surface is known as brightness. Its unit is
It is the ratio of illumination under normal condition of old installation to the illumination under ideal condition of new installation.
 Multiple Choice Question (MCQ) of Electronics page-17:241. Which of the following statement is true? a) The saturation voltage VCF of silicon transistor is more than germanium transistor. b) The saturation voltage VCE for germanium transistor is more than silicon transistor. c) The saturation voltage VCE for silicon transistor is same as that for germanium. d) The saturation voltage VCE for silicon transistor is lower than germanium transistor. |
Multiple Choice Question (MCQ) of Electronics page-16:226. Which of the following statement is correct? a) Inner electrons are always present in the semiconductor. b) Bound electrons are always present in the semiconductor. c) Free electrons are always present in the semiconductor. d) Inner and bound electrons are always present in the semiconductor. |
Multiple Choice Question (MCQ) of Electronics page-15:211. The materials whose electrical conductivity is usually less than 1 × 106 mho/m are a) Semiconductors b) Conductors c) Insulators d) Alloys |
Multiple Choice Question (MCQ) of Electronics page-14:196. In which of the following device the base resistors are not added in the package but added externally? a) UJT b) CUJT c) PUT d) None of the above |
Multiple Choice Question (MCQ) of Electronics page-13:181. The conduction in JEFT is always by the a) Majority carriers b) Minority carriers c) Holes d) Electrons e) Holes and electrons simultaneously |